JP2004237728A - Inkjet recording sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inkjet recording sheet which is excellent in prevention of migration and blurring and the like, as well as in water resistance of an ink receiving layer, and can yield an image having good water resistance. <P>SOLUTION: This inkjet recording sheet comprises a substrate and an ink receiving layer. At least one layer constituting the ink receiving layer contains, as a filler, silica, which has such a particle diameter distribution that a first peak or a shoulder peak appears at a particle diameter of 3.0 to 5.5 μm and a second peak or a shoulder peak appears at a particle diameter of 6.5 to 15.0 μm, and is formed by applying a coating liquid, for the formation of a receiving layer, containing, as a binder, an emulsion of a resin containing a silanol-modified polyvinyl alcohol in protective colloid and drying the coating. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to an inkjet recording sheet. More specifically, the present invention relates to an ink jet recording sheet excellent in prevention of image disturbance (migration) and bleeding caused by a change with time after printing.

  2. Description of the Related Art In recent years, with the widespread use of computer technology, materials produced by computers have been frequently printed out using a printer or the like. Printers used at that time include dot impact printers, laser printers, thermal printers, inkjet printers, etc., but there is almost no mechanical noise at the time of printout, and the running cost associated with printout is low, Ink jet printers are widely used.

In this inkjet printer, recording of images, characters, and the like is performed by causing fine droplets of ink to fly at high speed from nozzles toward a recording sheet and adhere to a recording surface.
The ink jet recording sheet used in such an ink jet printer has a high density of print dots, a bright and vivid color tone, a rapid ink absorption, and ink flowing or bleeding even when the print dots overlap. It is required that the diffusion of the print dots in the horizontal direction does not become unnecessarily large, that the ink receiving layer has excellent water resistance and that the image has good water resistance.

In order to satisfy such characteristics, it is important to balance the ink absorbency and the strength of the ink receiving layer. There is known an ink jet recording sheet in which small silica is blended (for example, see Patent Document 1).
However, the above-described ink jet recording sheet has a problem that image disturbance (migration) caused by a change with time after printing is likely to occur. In recent years, printers with a large ink ejection amount have been increasing, and it is important to overcome migration.

In this description, “migration” refers to a phenomenon in which ink spreads in a horizontal direction (parallel to a base material and perpendicular to a jetting direction) after printing, causing an image to be disturbed. A phenomenon in which the ink spreads in the horizontal direction after printing and the image is disturbed and occurs immediately after printing, not due to a change over time, is referred to as "bleeding" and distinguished.
The distinction between “depending on aging” and “immediately after printing” is defined as “depending on aging” when the surface is dried. It is presumed that “bleeding” is mainly caused by insufficient ink absorption capacity or absorption speed. It is presumed that “migration” is mainly caused by the movement of the coloring material (dye or pigment) with the movement of water or solvent in the ink after being absorbed by the ink receiving layer.
In particular, it is likely to occur in a state in which water, alcohol, and the like in the ink are not easily evaporated (when the inside of the coating layer is stored in a file in a state of being semi-dried, storage in a dark room or the like). When printing is performed on an ink jet recording sheet in which migration occurs, particularly when fine white characters are printed, a phenomenon appears in which the characters are stained with surrounding colors instead of pure white.

JP 2001-47736 A

  Under such circumstances, the present invention provides an ink jet recording sheet that is excellent in prevention of migration and bleeding, has excellent water resistance of an ink receiving layer, and has good water resistance of an image. It is the purpose.

  The present inventors have conducted intensive studies to develop an ink jet recording sheet having the above-mentioned preferable properties, and as a result, contain silica having a large particle size and small silica as a filler and contain silanol-modified polyvinyl alcohol in a protective colloid. It has been found that the object can be achieved by applying and drying a coating liquid for forming a receiving layer containing an emulsion of a resin to be formed as a binder on a substrate. The present invention has been completed based on such findings.

That is, the present invention
(1) An ink jet recording sheet having a substrate and an ink receiving layer, wherein at least one of the ink receiving layers has a first peak or a shoulder peak at a particle size of 3.0 to 5.5 μm in a particle size distribution. Containing silica having a second peak or a shoulder peak at a particle size of 6.5 to 15.0 μm as a filler, and containing, as a binder, an emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid. An ink jet recording sheet, which is a layer formed by applying and drying a layer forming coating liquid,
(2) silica having a first peak or shoulder peak at 1.0 to 1.4 ml / g and a second peak or shoulder peak at 1.6 to 2.1 ml / g in the pore volume distribution; (1) an ink jet recording sheet,
(3) Silica having a particle size of 3.0 to 5.5 μm and a pore volume of 1.0 to 1.4 ml / g, and silica having a particle size of 6.5 to 15.0 μm and a pore volume of 1. (1) or (2) a sheet for inkjet recording, which is a mixture with silica of 6 to 2.1 ml / g;
(4) Silica (A) having a particle diameter of 3.0 to 5.5 μm and a pore volume of 1.0 to 1.4 ml / g, and a pore volume of 1.6 to 15.0 μm and a pore volume of 1.6. (3) The inkjet recording sheet according to (3), wherein the ratio (A / B) of the silica (B) is from 1.5 to 9.0 ml / g.
(5) The inkjet recording sheet according to any one of (1) to (4), wherein the resin forming the emulsion of the resin containing silanol-modified polyvinyl alcohol is an acrylate resin.
(6) The coating liquid for forming a receiving layer is at least one selected from a polymer of dimethylamine and epichlorohydrin, a dicyandiamide condensate, a polydiallylamine, a polyallylamine, and a copolymer of diallylamine and allylamine. (1) to (5), wherein the cationic organic substance is a mixture of polydiallylamine and polyallylamine (6). The present invention also provides an ink jet recording sheet described in (1).

  In the ink jet recording sheet of the present invention, at least one of the ink receiving layers has a first peak or a shoulder peak at a particle size of 3.0 to 5.5 μm in a particle size distribution, and a particle size of 6.5 to 15. Coating and drying of a coating liquid for forming a receiving layer containing silica having a second peak or a shoulder peak at 0 μm as a filler and containing as a binder an emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid. Although the layer is formed by performing such a process, such a configuration is excellent in the performance of preventing migration and bleeding, the water resistance of the ink receiving layer is excellent, and the water resistance of the image is also good.

The ink jet recording sheet of the present invention is an ink jet recording sheet having a substrate and an ink receiving layer.
The substrate is not particularly limited as long as it is a sheet. Various materials such as plastic film, paper, and nonwoven fabric can be used. In particular, a plastic film is preferable from the viewpoint of water resistance.
As the plastic film, for example, it can be appropriately selected from general thermoplastic resin films such as vinyl chloride, polyethylene terephthalate, polypropylene, polystyrene, and polycarbonate. If necessary, inorganic powder such as calcium carbonate, organic pigment, biodegradable plastic, synthetic paper, and the like can be used.

  Further, a foamed plastic film can be used as the base material. Here, the foamed plastic film refers to a plastic film having a crack or a defect formed on the surface or inside of the film, or having fine bubbles or voids. These bubbles and cavities can be formed by various methods. For example, there are various types such as stretching a film containing an inorganic powder such as calcium carbonate to generate around the inorganic powder, and foaming a blowing agent in a film containing a blowing agent. In the present invention, the form of formation such as a method for forming cracks and bubbles is not limited. Further, the foamed plastic film referred to herein includes a film called a microvoid film.

The substrate may have a single-layer structure or a multilayer structure. As a method of forming a multilayer structure, for example, a method of laminating layers via an adhesive, a so-called co-extrusion method of extruding and joining a plurality of raw materials from a plurality of extruders to form a film, an extruder on a film A film formed by any known method such as a so-called extrusion lamination method in which the films are laminated while being extruded directly from the substrate can be used.
The thickness of these substrates is selected in the range of usually 10 to 400 μm, preferably 50 to 150 μm.

  When a plastic substrate is used as the substrate, if necessary, one or both surfaces of the substrate may be oxidized for the purpose of improving the adhesion and wettability with a layer provided thereon. Surface treatment can be carried out by a method or a method for making the surface uneven. Examples of the oxidation method include a corona discharge treatment and a hot air treatment. Examples of the unevenness method include a sand blast method and a solvent treatment method. The surface treatment method is appropriately selected according to the type of the base material, but generally, the corona discharge treatment method is preferably used from the viewpoints of effects and operability. Further, an easy adhesion treatment can be performed.

In the recording sheet of the present invention, the filler has a first peak or shoulder peak at a particle size of 3.0 to 5.5 μm in the particle size distribution, and a particle size of 6.5 to 15.0 μm. Has at least one ink-receiving layer containing silica having a second peak or a shoulder peak. The particle size distribution referred to here is a particle size distribution of an average primary particle size by a Coulter counter method.
Further, in the pore volume distribution, silica having a first peak or a shoulder peak at 1.0 to 1.4 ml / g and a second peak or a shoulder peak at 1.6 to 2.1 ml / g is preferable. Here, the pore volume distribution is a pore volume distribution obtained by a nitrogen adsorption method.
Silica having two peaks or shoulder peaks in the particle size distribution and pore volume distribution generally includes silica (A) having a first peak particle size and pore volume, and silica having a second peak particle size and fineness. A mixture of two kinds of silica (B) having a pore volume is used, and the ratio (A / B) is preferably in the range of 1.5 to 9.0, more preferably 1.8 to 3.0. It is in the range of 0. If A / B is less than 1.5, the strength of the coating layer will decrease, and if it exceeds 9.0, the ink absorbing capacity and ink absorbing speed will decrease.

As the silica, those manufactured according to a known method or commercially available ones can be used. From these, the silica can be selected and used so as to obtain the particle size distribution defined in the present invention. For example, “Fuji Silysia Chemical Ltd., trade name: Thylithia 440” having the first peak particle size and pore volume, and “WR. Grace & Co., trade name: SYLOJET P412 ". Silica is preferably a gel type of a wet method.
As the filler, only silica may be used, but if necessary, other fillers may be mixed and used as long as the effects of the present invention are not impaired. In that case, the substance that can be used as the filler is not limited to organic and inorganic substances, and includes calcium carbonate, talc, clay, diatomaceous earth, aluminum hydroxide, polystyrene, polymethacrylate, titanium oxide, calcined kaolin and the like. However, it is appropriate that the usage ratio of the filler other than silica is 10% by mass or less of the whole filler.

An emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid is used as a binder in the ink receiving layer of the ink jet recording sheet of the present invention.
The method for producing an emulsion of a resin having a protective colloid is not limited, but it can be produced by using a water-soluble polymer instead of a surfactant as an emulsifier during the polymerization reaction of a water-insoluble polymer.
In the present invention, the protective colloid needs to contain a hydrophilic substance, and the hydrophilic substance is preferably partially saponified polyvinyl alcohol.
The components of the protective colloid include, in addition to silanol-modified polyvinyl alcohol, other types of polyvinyl alcohol, oligomers of water-insoluble polymers, starch, and water-soluble cellulose derivatives.
The content of the silanol-modified polyvinyl alcohol in the protective colloid is preferably from 20 to 90% by mass, particularly preferably from 40 to 80% by mass. If the content of the silanol-modified polyvinyl alcohol is less than this range, it is difficult to obtain satisfactory enhancement of the layer strength and the color of the image, and if it exceeds this range, it is difficult to form an emulsion.

On the other hand, the resin having a protective colloid in the emulsion, that is, the resin serving as the core of the protective colloid, includes an acrylate resin, a (meth) acrylate resin, a styrene-acryl copolymer resin, an ethylene-vinyl acetate copolymer resin, (Meth) acrylate copolymers and the like. Further, those resins having a hydroxyl group may also be used. When these resins have a hydroxyl group, the dispersibility of the coating liquid is improved, so that the resin is suitable for storage after preparation of the coating liquid, and the same coating layer can be stably provided. It is preferable that the hydroxyl group is in the range of 5 to 15% by mass. In addition, acrylic ester resins are preferred because they have the effect of improving the light resistance of the coating layer. When the acrylate resin has a hydroxyl group, the portion other than the hydroxyl group of the acrylate resin is preferably 70 to 80% by mass in the solid content of the emulsion.
The content of the protective colloid in the emulsion is preferably 5 to 30% by mass. If the content of the protective colloid is less than this range, the stable system of the emulsion tends to be broken, and if it exceeds this range, the water resistance of the layer tends to decrease.
The glass transition temperature (Tg) of the emulsion is preferably 0 ° C. or lower in consideration of the film forming property and the curling prevention property of the coating layer. The ionicity of the emulsion is preferably nonionic or cationic. Particularly, considering the miscibility with a water-soluble cationic substance, a weak cationic property is preferable.

In the ink receiving layer, the content of the emulsion of the resin having silanol-modified polyvinyl alcohol in the protective colloid is preferably from 20 to 30% by mass, and particularly preferably from 23 to 28% by mass. If the content of the emulsion is less than this range, the strength of the ink receiving layer and the performance of preventing migration may decrease. Conversely, if the content exceeds this range, the ink absorption capacity and the ink absorption speed tend to decrease. When the ink receiving layer was formed by applying and drying a coating liquid for forming a receiving layer containing the emulsion as a binder, the ink was no longer an emulsion, and therefore, the emulsion in the ink receiving layer referred to here was not used. Means the content of the emulsion-derived solid content in the solid content of the coating solution for forming a receiving layer.
As the binder, only an emulsion of a resin having silanol-modified polyvinyl alcohol in the protective colloid may be used, but if necessary, one or two types of other binders may be used as long as the effects of the present invention are not impaired. The above may be used in combination.
In this case, examples of the binder that can be used include polyvinyl alcohol, polyvinyl butyral, gelatin, polyvinyl acetal, carboxymethyl cellulose, polyvinyl pyrrolidone, polyester, acrylic and urethane, and copolymers thereof. However, it is appropriate that the proportion of the binder other than the emulsion of the resin having silanol-modified polyvinyl alcohol in the protective colloid be 30% by mass or less based on the total solid content of the binder.

The ink receiving layer may contain a water-soluble cationic organic substance as an additive for the purpose of improving the effect of preventing image bleeding.
As the water-soluble cationic organic substance, at least one cationic substance selected from a polymer of dimethylamine and epichlorohydrin, dicyandiamide condensate, polydiallylamine, polyallylamine, and a copolymer of diallylamine and allylamine Organic substances can be used. Examples of the dicyandiamide condensate include a dicyandiamidediethylenetriamine polycondensate, a dicyandiamidepormarin polycondensate, and a condensate of a polyalkylenepolyamine and dicyandiamide.
Among these, the polymer of dimethylamine and epichlorohydrin, polydiallylamine, polyallylamine, and the copolymer of diallylamine and allylamine have the effect of preventing image bleeding and improve the water resistance of the image. This is preferable because the effect is large. In particular, it is preferable to use a mixture of polydiallylamine and polyallylamine because the light fastness of an image is improved. The mixture of polydiallylamine and polyallylamine preferably has a mass ratio of the former to the latter in the range of 1: 9 to 9: 1, and each is easy to handle in the form of a water-soluble salt.
When the hydrated aluminum oxide is contained in the ink receiving layer, the strength of the ink receiving layer is improved. Further, when basic aluminum lactate is contained, the image density (reflection density) is improved. In addition, if necessary, an antifoaming agent, an antistatic agent, an ultraviolet absorber, a fluorescent brightener, a preservative, a pigment dispersant, and a thickener may be added.

  The silica content (the total amount of silica having the first peak particle size and pore volume and silica having the second peak particle size and pore volume) as a solid content mass ratio to the ink receiving layer is preferably Is 50 to 70% by mass, more preferably 55 to 65% by mass. If the silica content is less than 50% by mass, the ink absorption capacity and the ink absorption rate may decrease, and if it exceeds 70% by mass, the strength of the ink receiving layer may decrease.

Further, the total amount of the cationic substance is preferably 2 to 15% by mass, more preferably 3 to 8% by mass, as a solid content mass ratio to the ink receiving layer. If the total amount of the cationic substance is less than 2% by mass, it is difficult to sufficiently obtain the effect of preventing image bleeding and the effect of improving the water resistance of the image, and if it exceeds 15% by mass, light resistance may be reduced. .
The addition amount of the hydrated aluminum oxide is preferably 2 to 7% by mass, more preferably 3 to 6% by mass. If the amount is less than 2% by mass, it is difficult to sufficiently obtain the effect of improving the strength, and if it exceeds 15% by mass, curling may occur.
The addition amount of the basic aluminum lactate is preferably 1 to 6% by mass, more preferably 2 to 4% by mass. If the amount is less than 1% by mass, it is difficult to sufficiently obtain the effect of improving the image density (reflection density), and if it exceeds 6% by mass, the ink absorption speed may be reduced.

  The thickness of the ink receiving layer is preferably from 20 to 45 μm, and more preferably from 25 to 35 μm. When the thickness of the ink receiving layer is less than 20 μm, the ink absorption capacity and the ink absorption speed are reduced, and the bleeding prevention performance may be reduced. If it exceeds 45 μm, the strength of the ink receiving layer may decrease.

  The inkjet recording sheet of the present invention has a first peak or a shoulder peak at a particle size of 3.0 to 5.5 μm in the particle size distribution, and a second peak or a shoulder peak at a particle size of 6.5 to 15.0 μm. An ink receiving layer formed by applying and drying a coating liquid for forming a receiving layer containing silica having a silica as a filler and containing an emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid as a binder. Although the ink receiving layer has at least one layer, the ink receiving layer of the present invention may be provided on one side of the substrate or on both sides. In addition, two ink receiving layers of the present invention may be provided on one side for the purpose of preventing cracks or the like.

Further, the ink jet recording sheet of the present invention may be provided with an ink receiving layer other than the ink receiving layer of the present invention. For example, another ink receiving layer may be provided on the surface opposite to the surface having the ink receiving layer of the present invention.
Further, the inkjet recording sheet of the present invention may be provided with another layer. For example, an anchor coat layer may be provided for the purpose of improving the adhesion between the ink receiving layer and the substrate. Further, a layer having high opacity may be provided for the purpose of improving the concealing property. An ultraviolet absorbing layer, a surface protective layer, and the like may be provided.

  In the ink jet recording sheet of the present invention, the ink receiving layer, the anchor coat layer and the like can be formed by applying a coating liquid in which necessary components are dispersed or dissolved and drying the coating liquid. For coating, various conventionally known methods such as reverse roll coating, air knife coating, gravure coating, and blade coating can be used.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
The performance of the ink jet recording sheet was evaluated according to the following procedure. For printing, an inkjet printer manufactured by Canon Inc. (model name: BJ-F9000) was used, and a genuine aqueous ink using a dye as a coloring material was used.

(1) Prevention of bleeding (immediately after printing) A white character pattern of a solid image (green, ink ejection amount 280%) was printed in a high-quality paper output mode.
The degree of penetration of the ink into the white area was visually observed.
○: No bleeding △: Some bleeding occurred, but no practical problem ×: Bleeding occurred, practically troublesome

(2) Migration The same image as in (1) was printed. Thirty minutes after printing, the print was sealed in a clear file and allowed to stand for three days, after which migration was visually observed.
○ ・ ・ ・ No migration △ ・ ・ ・ Slight migration occurred but no practical problem × ・ ・ ・ Migration occurred and practical problem

(3) Water resistance of image (dropping)
Five minutes after printing, a drop of distilled water was dropped on the printing portion with a dropper, and the degree of ink outflow when the distilled water was completely absorbed was visually observed and evaluated according to the following criteria.
：: Almost no outflow △: Slight outflow occurred, but no problem in practical use ×: Many outflows occurred, and there was practically no problem (4) Water resistance of ink receiving layer The load was reduced to 100 g with a sufficiently wet cotton swab. Thus, the surface of the ink receiving layer of the ink jet recording sheet was rubbed until the ink receiving layer was detached, and the number of times required was counted and evaluated according to the following criteria. However, one reciprocation (about 50 mm in one way) of the swab was counted as one time.
：: 100 times or more △: 50 to 99 times ×: 49 times or less

Example 1
A coating liquid for anchor coating is applied on a substrate shown below to form an anchor coating layer having a thickness of 3 μm (after drying), and a coating liquid for forming an ink receiving layer is applied thereon. Then, a layer having a thickness of 30 μm (after drying) was formed to prepare an inkjet recording sheet. Table 1 shows the evaluation results.

As the substrate, a foamed polypropylene film having a thickness of 80 μm [Microvoid film, trade name: YUPO FPG80, manufactured by YUPO Corporation] was used.
As the coating liquid for anchor coating, a homogeneous mixture of the following components was used.
(a) 60 parts by mass of an acrylic resin (trade name: Acronal YJ-6221D, manufactured by BASF Dispersion, solid content concentration: 49% by mass, anionic)
(b) 10 parts by mass of calcium carbonate [trade name: Callite SA, manufactured by Shiroishi Central Research Institute, solid content concentration 100% by mass, aragonite type]
(c) 30 parts by weight of water

As a coating liquid for forming an ink receiving layer, a homogeneous mixture of the following components was used.
(a) Filler
11.5 parts by mass of silica [trade name: Sylysia 440, manufactured by Fuji Silysia Chemical Ltd., solid content concentration 100% by mass, particle size 3.5 μm, pore volume 1.25 ml / g] R. Grace & Co. Product name: SYLOJET P412, solid content concentration 100% by mass, particle size 7.5 μm, pore volume 2.05 ml / g] 5.1 parts by mass
(b) Binder
Emulsion of resin [OLZ-1202-49, manufactured by Showa Polymer Co., Ltd., silanol-modified polyvinyl alcohol with a solid content of 45.5%, protective colloid of 50% by mass and partially saponified polyvinyl alcohol of 50% by mass. Consisting of a (meth) acrylate copolymer as a main component, Tg: 0 ° C., weakly cationic] 16.0 parts by mass
(c) Additives / cationic substance (polymer of dimethylamine and epichlorohydrin) [manufactured by Nichika Chemical Co., Ltd., trade name: Neofix RE, solid content concentration 40% by mass] 3.9 parts by mass / water 14.7 parts by mass of aluminum oxide [manufactured by Nissan Chemical Industries, Ltd., trade name: alumina sol 200, fibrous, solid content concentration 10 mass%, cationic] 14.7 parts by mass, basic aluminum lactate [trade name, manufactured by Taki Chemical Co. : Taxelam M160L, solid content 25% by mass, cationicity) 3.3 parts by mass, optical brightener [manufactured by Bayer Co., Ltd., trade name: BLANKOPHOR UW liquid, solid content concentration 100% by mass] ] 0.1 parts by mass / water 46.0 parts by mass

Example 2
From 3.9 parts by mass of the cationic substance in the ink receiving layer coating liquid in Example 1, a mixed aqueous solution of a polydiallylamine salt and a polyallylamine salt [trade name: manufactured by Nikka Chemical Co., Ltd .; Neofix RX-100, solid content concentration 19% by mass] The same operation as in Example 1 was carried out except for changing to 8.2 parts by mass to prepare an ink jet recording sheet. Table 1 shows the evaluation results.

Example 3
The cationic substance in the coating solution for the ink receiving layer in Example 1 was converted from 3.9 parts by mass of [Neofix RE] to a dicyandiamide condensate [Nichia Chemical Co., trade name: Neofix E-117, solid] [Concentration: 50% by mass] An ink jet recording sheet was prepared in the same manner as in Example 1, except that 3.2 parts by mass was used. Table 1 shows the evaluation results.

Example 4
The cationic substance in the coating liquid for the ink receiving layer in Example 1 was converted from 3.9 parts by mass of [Neofix RE] to a special cationic polymer [Sumitomo Chemical Co., Ltd., trade name: Sumireze Resin 1001, solid Separation concentration: 30% by mass] The same operation as in Example 1 was carried out except that the composition was changed to 5.3 parts by mass to produce an ink jet recording sheet. Table 1 shows the evaluation results.

Example 5
16.0 parts by mass of the resin emulsion [OLZ-1202-49] in the coating liquid for the ink receiving layer in Example 1 was mixed with a acrylate resin having a hydroxyl group and containing silanol-modified polyvinyl alcohol in the protective colloid. An ink jet recording sheet was prepared in the same manner as in Example 1, except that 15.9 parts by mass of the emulsion [solid content concentration: 45.7% by mass] was used. Table 1 shows the evaluation results.

Comparative Example 1
16.0 parts by mass of the resin emulsion [OLZ-1202-49] in the coating liquid for the ink receiving layer in Example 1 was mixed with polyvinyl alcohol [manufactured by Kuraray Co., Ltd., trade name: Kuraray R Polymer R-1130, solid content concentration]. 100% by mass, nonionic property] An ink jet recording sheet was prepared in the same manner as in Example 1, except that 6.9 parts by mass was used. In addition, Kuraray R polymer R-1130 does not have a protective colloid. Table 1 shows the evaluation results.

Comparative Example 2
16.0 parts by mass of the resin emulsion [OLZ-1202-49] in the coating liquid for the ink receiving layer in Example 2 was mixed with polyvinyl alcohol [manufactured by Kuraray Co., Ltd., trade name: Kuraray R Polymer R-1130, solid content concentration]. 100% by mass, nonionic property] An ink jet recording sheet was produced in the same manner as in Example 2 except that 6.9 parts by mass was used. Table 1 shows the evaluation results.

Comparative Example 3
16.0 parts by mass of the resin emulsion [OLZ-1202-49] in the coating liquid for the ink receiving layer in Example 3 was mixed with polyvinyl alcohol [manufactured by Kuraray Co., Ltd., trade name: Kuraray R Polymer R-1130, solid content concentration]. 100 mass%, nonionicity] An ink jet recording sheet was produced in the same manner as in Example 3, except that 6.9 parts by mass was used. Table 1 shows the evaluation results.

Comparative Example 4
16.0 parts by mass of the resin emulsion [OLZ-1202-49] in the ink receiving layer coating liquid in Example 4 was mixed with polyvinyl alcohol [manufactured by Kuraray Co., trade name: Kuraray R Polymer R-1130, solid content concentration]. 100 mass%, nonionicity] An ink jet recording sheet was produced in the same manner as in Example 3, except that 6.9 parts by mass was used.

The ink jet recording sheet of the present invention is excellent in the performance of preventing migration and bleeding, etc., also excellent in water resistance of the ink receiving layer, and excellent in water resistance of the image, and is suitable for water-based ink, especially for dye ink. Used for

Claims (7)

An ink jet recording sheet having a substrate and an ink receiving layer, wherein at least one of the ink receiving layers has a first peak or a shoulder peak at a particle size of 3.0 to 5.5 μm in a particle size distribution, For forming a receiving layer containing silica having a second peak or a shoulder peak at a particle size of 6.5 to 15.0 μm as a filler and containing, as a binder, an emulsion of a resin containing silanol-modified polyvinyl alcohol in a protective colloid. An ink jet recording sheet, which is a layer formed by applying and drying a coating liquid. The silica has a pore volume distribution having a first peak or a shoulder peak at 1.0 to 1.4 ml / g and a second peak or a shoulder peak at 1.6 to 2.1 ml / g. 2. The ink jet recording sheet according to 1. The silica has a particle size of 3.0 to 5.5 μm and a pore volume of 1.0 to 1.4 ml / g, and the silica has a particle size of 6.5 to 15.0 μm and a pore volume of 1.6 to 2. 3. The ink jet recording sheet according to claim 1, which is a mixture with silica having a concentration of 0.1 ml / g. Silica (A) having a particle size of 3.0 to 5.5 μm and a pore volume of 1.0 to 1.4 ml / g, and a pore volume of 1.6 to 2.0 with a particle size of 6.5 to 15.0 μm. The inkjet recording sheet according to claim 3, wherein the ratio (A / B) of the silica (B) that is 1 ml / g is in a range of 1.5 to 9.0. The inkjet recording sheet according to any one of claims 1 to 4, wherein the resin forming the emulsion of the resin containing silanol-modified polyvinyl alcohol is an acrylate resin. The coating liquid for forming a receiving layer further comprises at least one cationic selected from a polymer of dimethylamine and epichlorohydrin, a dicyandiamide condensate, a polydiallylamine, a polyallylamine, and a copolymer of diallylamine and allylamine. The inkjet recording sheet according to claim 1, which contains an organic substance. 7. The ink jet recording sheet according to claim 6, wherein the cationic organic substance is a mixture of polydiallylamine and polyallylamine.